<html>

<head>
    <style>
        table,
        table tr th,
        table tr td {
            border: 1px solid black;
        }

        table {

            border-collapse: collapse;
        }
        th {
            background-color: darkblue;
            color: yellow;
        }
    </style>
    <script src="preview.js"></script>
</head>

<body>

</body>

</html>